Types of ACM Drivers (Windows Embedded CE 6.0)
1/6/2010
The following information shows the types of ACM drivers and explains their purpose.
Codec
Codecs convert one audio format type to another; typically, a compressed format to an uncompressed format. A codec can convert a compressed format, such as MS-ADPCM, to an uncompressed format, such as PCM, which most audio hardware can play directly.
Converter
Converters change one variety of a format to another. For example, a converter can convert a PCM audio stream sampled at 44 kilohertz (kHz) to a PCM audio stream sampled at 11 kHz.
Filter
Filters modify audio data without changing the format of the data. Filters generally are used to add some sort of audio effect to an audio stream. Filters perform tasks, such as equalizing graphics or adding an echo to an audio stream.